Cutts, Martin, author
Oxford University Press, 1995
Buku Teks
Dupre, Lyn, author
Addison-Wesley, 1995
Buku Teks
Ginsberg, Gerald L., author
John Wiley & Sons, 1981
Buku Teks
Barrass, Robert, author
Routledge, 1995
Buku Teks
Fenderson, Claudia B., author
Erlangga, 2009
Buku Referensi